Ionic Equilibrium(Weak and Strong Electrolytes, Ionization of Electrolytes, Various Concepts of Acids and Bases...) NEET Questions

Physical Chemistry - Equilibrium

Ionic Equilibrium(Weak and Strong Electrolytes, Ionization of Electrolytes, Various Concepts of Acids and Bases...) MCQ Questions


13.
According to Lewis concept, an acid is:
A.
An electron pair donor
B.
A proton donor
C.
A hydroxide ion donor
D.
An electron pair acceptor
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ANSWER :
D. An electron pair acceptor
14.
Which of the following is a Lewis acid?
A.
OH-
B.
NH3
C.
H2O
D.
BF3
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ANSWER :
D. BF3
15.
Which of the following can act as a Lewis base?
A.
Mg2+
B.
AlCl3
C.
NH3
D.
BCl3
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ANSWER :
C. NH3
16.
In the reaction BF3 + NH3 → F3B-NH3, BF3 acts as:
A.
Bronsted base
B.
Lewis acid
C.
Lewis base
D.
Bronsted acid
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ANSWER :
B. Lewis acid
17.
The ionization constant of a weak acid HA increases when:
A.
Temperature increases
B.
Volume increases
C.
Pressure increases
D.
Concentration increases
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ANSWER :
A. Temperature increases
18.
Which of the following relations is correct for a conjugate acid-base pair in water at 298 K?
A.
Ka × Kb = pKw
B.
Ka / Kb = Kw
C.
Ka + Kb = Kw
D.
Ka × Kb = Kw
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ANSWER :
D. Ka × Kb = Kw